Slide-valve



(No Model.)

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UNITED STATES PATENT OFFICE.

BENJAMIN OARLEY, OF PATERSON, NEl/V JERSEY.

SLI DE-VALVE.

SPECIFICATION forming part of Letters Patent No. 406,258, dated July 2, 1889.

Application filed October 15, 1888.

T0 aZZ whom it may concern.-

Be it known that I, BENJAMIN OARLEY, of Paterson, in the county of Passaic and State of New Jersey, have invented a new and useful Improvement in Slide-Valves for Engines, of which the following is a specification, reference being had to the accompanying draw- This invention relates to slide-valves working one within the other on the same seat. Such a combination of valves is illustrated in my Letters Patent, No. 282,162, dated July 31, 1883. In the specification and drawings of those Letters Patent there is shown a rod extending longitudinally through the two valves for the purpose of preventing the rising of the outer valve from its seat. That rod was found necessary with valves such as at the time of applying for those Letters Patent I intended to use-viz, valves having the dimensions of their inner cavities in a direction transverse to the direction of their movement as great as the dimension of the eduction-port of the valve-seat in the same direction; or, in other words, valves having coves or cavities of a width equal to the length of the eduction-port, as has been customary with engine slide-valves.

The object of this invention is to obviate the necessity for the rod hereinabove mentioned and to prevent all liability of the outer valve to be lifted by any pressure from within or below it; and to this end my improvement consists in the novel construction of the valves and ports, as hereinafter described and claimed, whereby the above-mentioned results are accomplished.

Figures 1 and 2 in the drawings represent vertical sections taken parallel with the direction of the stroke of the valve of a valveseat and valves embodying my invention and showing the valve in two positions. Fig. 3 represents a transverse section at right angles to Figs. 1 and 2 of the valves and seat, taken through the exhaust-port. Fig. 4 represents a plan of the valves and seat, the valves being shown in dotted outline and the seat in full outline. Fig. 5 represents a plan view illustrating a modification of the invention.

Similar letters of reference indicate corresponding parts in the several figures.

A designates the valve-seat having induc- Serial No. 288,113. (No model.)

tion-ports B B and an eduction-port C, which may be of the usual construction and form,

and are so represented in all the figures but Fig. 5, in which there is a modification of the eduction-port.

D designates the outer slide-valve, the end edges 8 s of which control the induction of steam to the ports B B in the same manner as the slide-valves in common use in locomotives. The sides of this valve bear upon the seat and outside ends of the ports B B- O in the usual manner, as shown at d d in Figs. 3 and 4. The said valve is or may be operated in the usual way by a yoke D.

E designates the inner slide-valve having a cove e for controlling the eduction of steam from the ports B B through the port 0. This valve E is represented as fitted to a cavity b b in the outer valve D to work with a lost motion therein, as indicated at b, in the same manner as illustrated and described in my hereiuabove-mentioned Letters Patent; but the said cavity, instead of being of nearly the whole width of the valve, and having in the direction transverse to the movement of the valve a dimension equal to or greater than the dimension of the eduction-port C in the same direction, is made much narrower or of a much less dimension in thedirection mentioned, so that a portion of the face of the said valve at each side of its cavity 1) covers the said port at each end of the latter, as indicated att in Figs. 3 aud t, and hence such portions of the valve-face are always exposed to the eduction-port, while the corresponding opposite portions of the back of the valve are always exposed to the pressure of the steam in the valve-chest, and hence the valve is held down to its seat.

I propose in practice that the eduction-port and the cavity shall be so proportioned that the portions of the face of the valve D that cover the said port shall be about equal to that of the portion of the said port included within the cove e of the valve. It is obvious that this reduction of the width of the cavity b of the outer valve D to make its face cover the ends of the eduction-port involves a considerable reduction of the width of the exhaust-cove e of the inner valve E as compared with the length of the eduction-port. In order to prevent to some extent this reduction of the width of the exhaust-cove, and yet to permit the faces of the outer valve D to cover a suitable area of the eduction-port G, the ends of the eduction-port may be made wider, as shown at O in Fig. 5, than the portion over which the exhaust-cove works to control the eduction of steam.

What I claim as my invention, and desire to secure by Letters Patent, is

The combination,with the slide-valve seat of an engine having two induction-ports and an interposed ednction-port, of valves arranged one within the other and both working on said seat with a lost motion between them, the outer valve for controlling the entrance of the motive agent to the said induction-ports and the inner one being coved for controlling the exhaust through said induction-ports to said eduction-port, the inner valve and the cavity in the outer valve wherein the inner one Works being of less dimension in a direction transverse to the direction of the movement of the valve than the dimension of the eduction-port in the same direction, whereby portions of the face of the outer valve are always exposed to the eduotion-port, substantially as and for the purpose herein set forth.

. BENJAMIN CARLEY. \Vitnesses:

STEPHEN WIsEMAN,

HENRY E. SAMUELS. 

